INTERACTIVE TOOL
Exact age calculator
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How to use this tool
- Enter the birth date.
- Choose a reference date.
- Distinguish completed years from elapsed days.
Formula or method usedThe difference is calendar-based, adjusting months and days rather than dividing total days.
Worked example
Someone born on May tenth completes another year on May tenth, not at the start of a calendar year.
Assumptions and limits
February twenty-ninth anniversary conventions may vary; this does not determine legal eligibility.
Frequently asked questions
Does it account for leap years?+
Yes. The calculation uses real calendar dates in the browser.
What happens to my inputs?+
Calculation inputs are processed locally in your browser. Favorites and preferences may be saved on this device. The site may perform separate network requests for live panels; these do not include the values entered into this local calculator. Do not paste secrets into public tools.
How should I check the result?+
February twenty-ninth anniversary conventions may vary; this does not determine legal eligibility.